there are several possibilities. Using your description of the passenger floor being soaked with 'water', the first possibility is that the heater core ruptured. the heater core is a small radiator that is located under the right side of the instrument panel. the coolant circulates through the heater core and air is blown over the core when the temperature is set to HOT. so, if the heater core is leaking then there isn't coolant flowing through the core and the radiator isn't getting hot. To check this possibility, check under the carpet on that side. if it is coolant that is leaking from the core, the liquid will feel oily.
A more likely possibility is that it really is water that is on the floor. If that is the case then the problem is that the drail tube for the air conditioning evaporator is clogged. What then happens is that the condensation that forms on the cool evaporator coils does not run out of the drain tube but rather it fills the evaporator case with water. that case is common to the heater core and if the heater core is submerged in water then the heat from the coolant will not be transferred to the air. that is pulled into the car. the reason the floor gets wet is that the condensation keeps forming but the water has no where to go so it spills out onto the floor. usually you'll hear a sloshing noise from the right side on turns when this is the case but if the case if full you won't hear it. This is my best guess as to what is happening. the fix is eaxy--just get the drain tube cleaned out. Any shop can blow compressed air up the tube from under the car to clear it of debris. I'll bet on this as the cause.
third, would be that the coolant level in the radiator is very low. without coolant to circulate, there is no heat.
fourth is a thermostat that is not opening, but when that happens your engine would run Hot. I assume that is not happening.
lastly, the temperature control knob may be stripped. if that's the case, you think you are turning the temp control to hot but the knob isn't turning the control. you can usually pull off the knob to ckeck if the base is cracked.
so, if it really is water on the floor and not coolant, then get the drain tube cleaned and I bet you'll have heat again. if its not water, look to a leaking heater core. then look to the other possibilites from there down
hope that helps
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